An English problem... :P
Unit 5 is ____ (the/a) most difficult lesson,but it isn't ____(the/a) most difficult one in Book Nine.

Help me,plz,and tell me why :P it really makes me messy lol

Question

An English problem... :P
Unit 5 is ____ (the/a) most difficult lesson,but it isn't ____(the/a) most difficult one in Book Nine.

Help me,plz,and tell me why :P it really makes me messy lol

Answer

ni hao,
for the superlative construction, you must always use "the":
nice>nicer>THE nicest
beautiful>more beautiful>THE most beautiful
difficult>more difficult>THE most difficult